Watch case



FIG. 1 is a perspective view of my new, original and ornamental design for a watch case;

FIG. 2 is a perspective view in an opened state thereof; and,

FIG. 3 is a rear view thereof.

The broken lines shown in FIGS. 1 and 2 are for illustrative purposes only and form no part of the claimed design. 

The ornamental design for a watch case, as shown and described. 